ABS (Antilock Brake System)

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: PRECAUTION

PRECAUTION

1. TROUBLESHOOTING PRECAUTIONS
(a) When there are malfunctions with terminal contact points or part installation problems, removal and installation of the suspected problem parts may return the system to the normal condition either completely or temporarily.
(b) In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the Freeze Frame Data, and record it before disconnecting each connector or removing and installing parts.
(c) Since the system may be influenced by malfunctions in systems other than the ABS system, be sure to check for DTCs in other systems.
2. HANDLING PRECAUTIONS
(a) Be sure to remove and install the ECU, brake actuator and each sensor, etc. with the ignition switch OFF, unless it is specified in the inspection procedure.
(b) If the ECU, brake actuator or a sensor has been removed and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using a Techstream, also check that system functions and signals received by the ECU are normal using Test Mode.
3. DTC PRECAUTION
(a) Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed after repair work, the DTC should be cleared after turning the ignition switch to OFF.
NOTE: If a DTC for a malfunctioning part reappears after it was cleared, then it has been stored again.

4. CAN COMMUNICATION SYSTEM PRECAUTIONS
(a) The CAN communication system is used for data communication between the skid control ECU, the steering angle sensor, the yaw rate sensor (acceleration sensor included) and other ECUs. If there is trouble in the CAN communication line, corresponding communication line DTCs are output.
(b) If any CAN communication line DTC is output, repair the malfunction in the communication line and troubleshoot the ABS system while data communication is normal.
(c) In order to enable CAN communication, a specific type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires of equal length. A bypass wire should not be used because the data being transmitted will be corrupted.